| Mines of Montebras | France | 1 |
| Moctezuma | Mexico | 1 |
| Modra | Slovakia | 1 |
| Mokopane | South Africa | 1 |
| Mono Lake | United States | 1 |
| Mons Smaragdus | Egypt | 1 |
| Montaldo di Mondovì mine | Italy | 1 |
| Monte Alegre de Goiás | Brazil | 1 |
| Monte Giove | Italy | 1 |
| Monte Trisa mines | Italy | 1 |
| Morasko Meteorite Nature Reserve | Poland | 1 |
| Mori | Italy | 1 |
| Mount Bendock | Australia | 1 |
| Mount Bischoff | Australia | 1 |
| Mount Etna | Italy | 1 |
| Mount Nyiragongo | Nyiragongo Territory | 1 |
| Mount Suoluaiv | Russia | 1 |
| Mount Utsumine | Japan | 1 |
| Mount Vyuntspakhk | Russia | 1 |
| Munakata | Japan | 1 |
| Murghob District | Tajikistan | 1 |
| Murmansk Oblast | Russia | 1 |
| Mány | Hungary | 1 |
| Nabi Musa | Palestine | 1 |
| Nakkaalaaq | Greenland | 1 |
| Nankoku | Japan | 1 |
| Nant Ffrancon formation | United Kingdom | 1 |
| Nedre Eivollen | Norway | 1 |
| Neprimetnyi pegmatite | Mongolia | 1 |
| New Cliffe Hill Quarry | United Kingdom | 1 |
| New Guinea | Papua New Guinea | 1 |
| Newry | United States | 1 |
| Nezhilovo | North Macedonia | 1 |
| Nickel Mine | United States | 1 |
| Nieder-Beerbach | Germany | 1 |
| Niriella | Sri Lanka | 1 |
| Norbusa town | People's Republic of China | 1 |
| Norra Kärr mine project | Sweden | 1 |
| North Aurora mine | United States | 1 |
| Northwest Africa 1054 | Morocco | 1 |
| Northwest Africa 856 | Morocco | 1 |
| Norway | Norway | 1 |
| Novodneprovskoe deposit | Kazakhstan | 1 |
| Nueva Esparta | Venezuela | 1 |
| Nuussuaq Peninsula | Greenland | 1 |
| Nye County | United States | 1 |
| Népoui | France | 1 |
| Oberscheld | Germany | 1 |
| Oficina Maria Elena | Chile | 1 |
| Old Kilpatrick | United Kingdom | 1 |
| Olenii ridge | Russia | 1 |
| Omongwa salt pan | Namibia | 1 |
| Onello | Russia | 1 |
| Ophir | United States | 1 |
| Oppdal Municipality | Norway | 1 |
| Orapa diamond mine | Botswana | 1 |
| Oruro Department | Bolivia | 1 |
| Osarizawa mine | Japan | 1 |
| Oued Awlitis 001 | Western Sahara | 1 |
| Owyhee County | United States | 1 |
| Pampalo mine | Finland | 1 |
| Park County | United States | 1 |
| Parry Sound District | Canada | 1 |
| Parwan | Australia | 1 |
| Parádsasvár | Hungary | 1 |
| Patte d'Oie mine | Morocco | 1 |
| Patyn Mount Massif | Russia | 1 |
| Peace River meteorite | Canada | 1 |
| Peanut Mine | United States | 1 |
| Pedra Preta pit | Brazil | 1 |
| Pein Pyit area | Myanmar | 1 |
| Penland | United States | 1 |
| Penrice | Australia | 1 |
| Penrice quarry | Australia | 1 |
| Petrovice | Czech Republic | 1 |
| Peyrebrune | France | 1 |
| Pfaffenberg | Germany | 1 |
| Picacho Peak | United States | 1 |
| Pikes Peak | United States | 1 |
| Pilanesberg | South Africa | 1 |